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Discussion papers | Copyright
https://doi.org/10.5194/acp-2018-731
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 26 Jul 2018

Research article | 26 Jul 2018

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Long-term Lidar Observations of the Gravity Wave Activity near the Mesopause at Arecibo

Xianchang Yue1,2, Jonathan S. Friedman4, Qihou Zhou5, Xiongbin Wu1,2, and Jens Lautenbach3 Xianchang Yue et al.
  • 1School of Electronic Information, Wuhan University, Wuhan, 430072, China
  • 2Collaborative Innovation Center of Geospatial Technology, 129 Luoyu Road, Wuhan, 430072, China
  • 3Arecibo Observatory – University of Central Florida, Arecibo, Puerto Rico
  • 4Puerto Rico Photonics Institute, School of Science and Technology, Universidad Metropolitana, Cupey, Puerto Rico
  • 5Electrical and Computer Engineering Department, Miami University, Oxford, Ohio, USA

Abstract. 11-years long K Doppler lidar observations of temperature profiles in the mesosphere and lower thermosphere (MLT) between 85 and 100km, conducted at the Arecibo Observatory, Puerto Rico (18.35°N, 66.75°W), are used to estimate seasonal variations of the mean temperature, the squared Brunt-Väisälä frequency, and the gravity wave potential energy in a composite year. The following unique features are obtained: (1) The mean temperature structure shows similar characteristics as a prior report based on a smaller dataset: (2) The profiles of the squared Brunt-Väisälä frequency usually reach the maxima at or just below the temperature inversion layer when that layer is present. The first complete range-resolved climatology of potential energy of temperature fluctuations in the tropical MLT exhibits an altitude dependent combination of annual oscillation (AO) and semiannual oscillation (SAO). Between 88 to 96km altitude, the amplitudes of AO and SAO are comparable, and their phases are almost the same and quite close to day of year (DOY) 100. Below 88km, the SAO amplitude is significantly larger than AO and the AO phase shifts to DOY 200 and after. At 97 to 98km altitude, the amplitudes of AO and SAO reach their minima, and both phases shift significantly. Above that, the AO amplitude becomes greater. The annual mean potential energy profile reaches the minimum at 91 to 92km altitude. The altitude-dependent SAO of the potential energy is found to be highly correlated with the satellite observed mean zonal winds reported in the literature.

Xianchang Yue et al.
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More than ten years long lidar observations of temperature with high vertical and temporal resolutions in the tropical mesopause region give us the chance to address the seasonal activities of gravity waves in view of potential energy. This work fill the gap of the such research in this region. The seasonal wave activities are consistent with that of the background winds' magnitude and behave distinctively below and above the mesopause.
More than ten years long lidar observations of temperature with high vertical and temporal...
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